package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        /**
         * 通知
         */
        log.info(file.toString());
        /**
         * 原始文件“.”之前的文件名
         */
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
        /**
         * uuid
         */
        String filename = UUID.randomUUID().toString() + substring;

        /**
         * 创建目录
         */
        File dir = new File(basePath);

        if (!dir.exists()){
            //不存在，则创建
            dir.mkdir();
        }

        try {
            file.transferTo(new File(basePath + filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(filename);
    }
/**
 * 文件下载
 * @param name
 * @param response
 */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流，读取文件内容
            FileInputStream fileinputStream = new FileInputStream(new File(basePath + name));
            //输出流，输出文件内容到浏览器
            ServletOutputStream outputStream=response.getOutputStream();
            //返回文件类型
            response.setContentType("image/jpeg");

            int len=0;
            byte[] bytes=new byte[1024];
            while ((len=fileinputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileinputStream.close();
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}
